Method and system for producing purified aqueous hydrogen peroxide solution

Patent metadata

Field	Value
Publication number	US-11220430-B2
Application number	US-201816476957-A
Country	US
Kind code	B2
Filing date	Feb 21, 2018
Priority date	Feb 22, 2017
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

Provided are a method and system for efficiently producing a purified aqueous hydrogen peroxide solution having a high purity. This method for producing a purified aqueous hydrogen peroxide solution comprises: step A for vaporizing a raw material containing a crude aqueous hydrogen peroxide solution; step B for condensing at least a portion of the gas and liquid obtained in step A, and separating the gas and liquid into a gas phase and a liquid phase; and step C for returning, into the raw material, at least a portion of a separation liquid which is the separated liquid phase, wherein step C further includes step D for adjusting the concentration of hydrogen peroxide in the separation liquid.

First claim

The invention claimed is:

1. A method for producing a purified aqueous hydrogen peroxide solution, comprising the steps of: vaporizing a raw material containing a crude aqueous hydrogen peroxide solution (step A); condensing at least part of the gas liquor obtained in the step A to separate it into a gas phase and a liquid phase (step B); and recycling at least part of the separated liquid which is the liquid phase separated in the step B to the raw material (step C),
wherein the step C further comprises the step D of controlling the hydrogen peroxide concentration of the separated liquid.

2. The method for producing a purified aqueous hydrogen peroxide solution according to claim 1 , wherein the step D is performed by diluting the separated liquid with water.

3. The method for producing a purified aqueous hydrogen peroxide solution according to claim 1 , wherein the step C further comprises the step E of removing impurities from the separated liquid.

4. The method for producing a purified aqueous hydrogen peroxide solution according to claim 3 , wherein the step E is performed by bringing the separated liquid into contact with an ion-exchange resin.

5. The method for producing a purified aqueous hydrogen peroxide solution according to claim 1 , wherein the step C further comprises the step F of adding a stabilizer to the separated liquid.

6. The method for producing a purified aqueous hydrogen peroxide solution according to claim 1 , which further comprises the step G of concentrating the gas phase separated in the step B to obtain a purified aqueous hydrogen peroxide solution.

7. The method for producing a purified aqueous hydrogen peroxide solution according to claim 1 , wherein the step A is performed using a vaporizer.

8. The method for producing a purified aqueous hydrogen peroxide solution according to claim 1 , wherein the step B is performed using a gas-liquid separator.

9. The method for producing a purified aqueous hydrogen peroxide solution according to claim 8 , wherein the gas-liquid separator is a cyclone.

Assignees

• Mitsubishi Gas Chemical Co

Inventors

• Shigeta Kohei
• Kushida Yasuhiro
• Yamamoto Tetsuya
• Matsuura Shinichiro
• Ikeda Hidetoshi

Classifications

• B01J47/04

  Mixed-bed processes · CPC title

• C01B15/013 Primary

  Separation; Purification; Concentration · CPC title

• B01J39/04

  Processes using organic exchangers · CPC title

• B01D1/0082 Primary

  Regulation; Control · CPC title

• B01D3/14

  Fractional distillation {or use of a fractionation or rectification column} · CPC title